--- /dev/null
+/*
+ * Copyright (c) 1995-1998, Index Data.
+ * See the file LICENSE for details.
+ * Heikki Levanto
+ *
+ * Isamh - append-only isam
+ *
+ * TODO
+ * All of it
+ * Define structures
+ * Get append to work
+ */
+
+
+
+
+#include <stdlib.h>
+#include <assert.h>
+#include <string.h>
+#include <stdio.h>
+
+#include <log.h>
+#include "isamh-p.h"
+
+static void flush_block (ISAMH is, int cat);
+static void release_fc (ISAMH is, int cat);
+static void init_fc (ISAMH is, int cat);
+
+#define ISAMH_FREELIST_CHUNK 1
+
+#define SMALL_TEST 1
+
+ISAMH_M isamh_getmethod (void)
+{
+ static struct ISAMH_filecat_s def_cat[] = {
+#if SMALL_TEST
+ { 32, 3 },
+ { 64, 0 },
+#else
+ { 24, 10 },
+ { 128, 10 },
+ { 512, 10 },
+ { 2048, 10 },
+ { 8192, 10 },
+ { 32768, 0 },
+#endif
+ };
+ ISAMH_M m = (ISAMH_M) xmalloc (sizeof(*m));
+ m->filecat = def_cat;
+
+ m->code_start = NULL;
+ m->code_item = NULL;
+ m->code_stop = NULL;
+ m->code_reset = NULL;
+
+ m->compare_item = NULL;
+
+ m->debug = 1;
+
+ m->max_blocks_mem = 10;
+
+ return m;
+}
+
+
+ISAMH isamh_open (BFiles bfs, const char *name, int writeflag, ISAMH_M method)
+{
+ ISAMH is;
+ ISAMH_filecat filecat;
+ int i = 0;
+ int max_buf_size = 0;
+
+ is = (ISAMH) xmalloc (sizeof(*is));
+
+ is->method = (ISAMH_M) xmalloc (sizeof(*is->method));
+ memcpy (is->method, method, sizeof(*method));
+ filecat = is->method->filecat;
+ assert (filecat);
+
+ /* determine number of block categories */
+ if (is->method->debug)
+ logf (LOG_LOG, "isc: bsize ifill mfill mblocks");
+ do
+ {
+ if (is->method->debug)
+ logf (LOG_LOG, "isc:%6d %6d",
+ filecat[i].bsize, filecat[i].mblocks);
+ if (max_buf_size < filecat[i].mblocks * filecat[i].bsize)
+ max_buf_size = filecat[i].mblocks * filecat[i].bsize;
+ } while (filecat[i++].mblocks);
+ is->no_files = i;
+ is->max_cat = --i;
+ /* max_buf_size is the larget buffer to be used during merge */
+ max_buf_size = (1 + max_buf_size / filecat[i].bsize) * filecat[i].bsize;
+ if (max_buf_size < (1+is->method->max_blocks_mem) * filecat[i].bsize)
+ max_buf_size = (1+is->method->max_blocks_mem) * filecat[i].bsize;
+ if (is->method->debug)
+ logf (LOG_LOG, "isc: max_buf_size %d", max_buf_size);
+
+ assert (is->no_files > 0);
+ is->files = (ISAMH_file) xmalloc (sizeof(*is->files)*is->no_files);
+ if (writeflag)
+ {
+ is->merge_buf = (char *) xmalloc (max_buf_size+256);
+ memset (is->merge_buf, 0, max_buf_size+256);
+ }
+ else
+ is->merge_buf = NULL;
+ for (i = 0; i<is->no_files; i++)
+ {
+ char fname[512];
+
+ sprintf (fname, "%s%c", name, i+'A');
+ is->files[i].bf = bf_open (bfs, fname, is->method->filecat[i].bsize,
+ writeflag);
+ is->files[i].head_is_dirty = 0;
+ if (!bf_read (is->files[i].bf, 0, 0, sizeof(ISAMH_head),
+ &is->files[i].head))
+ {
+ is->files[i].head.lastblock = 1;
+ is->files[i].head.freelist = 0;
+ }
+ is->files[i].alloc_entries_num = 0;
+ is->files[i].alloc_entries_max =
+ is->method->filecat[i].bsize / sizeof(int) - 1;
+ is->files[i].alloc_buf = (char *)
+ xmalloc (is->method->filecat[i].bsize);
+ is->files[i].no_writes = 0;
+ is->files[i].no_reads = 0;
+ is->files[i].no_skip_writes = 0;
+ is->files[i].no_allocated = 0;
+ is->files[i].no_released = 0;
+ is->files[i].no_remap = 0;
+ is->files[i].no_forward = 0;
+ is->files[i].no_backward = 0;
+ is->files[i].sum_forward = 0;
+ is->files[i].sum_backward = 0;
+ is->files[i].no_next = 0;
+ is->files[i].no_prev = 0;
+
+ init_fc (is, i);
+ }
+ return is;
+}
+
+int isamh_block_used (ISAMH is, int type)
+{
+ if (type < 0 || type >= is->no_files)
+ return -1;
+ return is->files[type].head.lastblock-1;
+}
+
+int isamh_block_size (ISAMH is, int type)
+{
+ ISAMH_filecat filecat = is->method->filecat;
+ if (type < 0 || type >= is->no_files)
+ return -1;
+ return filecat[type].bsize;
+}
+
+int isamh_close (ISAMH is)
+{
+ int i;
+
+ if (is->method->debug)
+ {
+ logf (LOG_LOG, "isc: next forw mid-f prev backw mid-b");
+ for (i = 0; i<is->no_files; i++)
+ logf (LOG_LOG, "isc:%8d%8d%8.1f%8d%8d%8.1f",
+ is->files[i].no_next,
+ is->files[i].no_forward,
+ is->files[i].no_forward ?
+ (double) is->files[i].sum_forward/is->files[i].no_forward
+ : 0.0,
+ is->files[i].no_prev,
+ is->files[i].no_backward,
+ is->files[i].no_backward ?
+ (double) is->files[i].sum_backward/is->files[i].no_backward
+ : 0.0);
+ }
+ if (is->method->debug)
+ logf (LOG_LOG, "isc: writes reads skipped alloc released remap");
+ for (i = 0; i<is->no_files; i++)
+ {
+ release_fc (is, i);
+ assert (is->files[i].bf);
+ if (is->files[i].head_is_dirty)
+ bf_write (is->files[i].bf, 0, 0, sizeof(ISAMH_head),
+ &is->files[i].head);
+ if (is->method->debug)
+ logf (LOG_LOG, "isc:%8d%8d%8d%8d%8d%8d",
+ is->files[i].no_writes,
+ is->files[i].no_reads,
+ is->files[i].no_skip_writes,
+ is->files[i].no_allocated,
+ is->files[i].no_released,
+ is->files[i].no_remap);
+ xfree (is->files[i].fc_list);
+ flush_block (is, i);
+ bf_close (is->files[i].bf);
+ }
+ xfree (is->files);
+ xfree (is->merge_buf);
+ xfree (is->method);
+ xfree (is);
+ return 0;
+}
+
+int isamh_read_block (ISAMH is, int cat, int pos, char *dst)
+{
+ ++(is->files[cat].no_reads);
+ return bf_read (is->files[cat].bf, pos, 0, 0, dst);
+}
+
+int isamh_write_block (ISAMH is, int cat, int pos, char *src)
+{
+ ++(is->files[cat].no_writes);
+ if (is->method->debug > 2)
+ logf (LOG_LOG, "isc: write_block %d %d", cat, pos);
+ return bf_write (is->files[cat].bf, pos, 0, 0, src);
+}
+
+int isamh_write_dblock (ISAMH is, int cat, int pos, char *src,
+ int nextpos, int offset)
+{
+ ISAMH_BLOCK_SIZE size = offset + ISAMH_BLOCK_OFFSET_N;
+ if (is->method->debug > 2)
+ logf (LOG_LOG, "isc: write_dblock. size=%d nextpos=%d",
+ (int) size, nextpos);
+ src -= ISAMH_BLOCK_OFFSET_N;
+ memcpy (src, &nextpos, sizeof(int));
+ memcpy (src + sizeof(int), &size, sizeof(size));
+ return isamh_write_block (is, cat, pos, src);
+}
+
+#if ISAMH_FREELIST_CHUNK
+static void flush_block (ISAMH is, int cat)
+{
+ char *abuf = is->files[cat].alloc_buf;
+ int block = is->files[cat].head.freelist;
+ if (block && is->files[cat].alloc_entries_num)
+ {
+ memcpy (abuf, &is->files[cat].alloc_entries_num, sizeof(int));
+ bf_write (is->files[cat].bf, block, 0, 0, abuf);
+ is->files[cat].alloc_entries_num = 0;
+ }
+ xfree (abuf);
+}
+
+static int alloc_block (ISAMH is, int cat)
+{
+ int block = is->files[cat].head.freelist;
+ char *abuf = is->files[cat].alloc_buf;
+
+ (is->files[cat].no_allocated)++;
+
+ if (!block)
+ {
+ block = (is->files[cat].head.lastblock)++; /* no free list */
+ is->files[cat].head_is_dirty = 1;
+ }
+ else
+ {
+ if (!is->files[cat].alloc_entries_num) /* read first time */
+ {
+ bf_read (is->files[cat].bf, block, 0, 0, abuf);
+ memcpy (&is->files[cat].alloc_entries_num, abuf,
+ sizeof(is->files[cat].alloc_entries_num));
+ assert (is->files[cat].alloc_entries_num > 0);
+ }
+ /* have some free blocks now */
+ assert (is->files[cat].alloc_entries_num > 0);
+ is->files[cat].alloc_entries_num--;
+ if (!is->files[cat].alloc_entries_num) /* last one in block? */
+ {
+ memcpy (&is->files[cat].head.freelist, abuf + sizeof(int),
+ sizeof(int));
+ is->files[cat].head_is_dirty = 1;
+
+ if (is->files[cat].head.freelist)
+ {
+ bf_read (is->files[cat].bf, is->files[cat].head.freelist,
+ 0, 0, abuf);
+ memcpy (&is->files[cat].alloc_entries_num, abuf,
+ sizeof(is->files[cat].alloc_entries_num));
+ assert (is->files[cat].alloc_entries_num);
+ }
+ }
+ else
+ memcpy (&block, abuf + sizeof(int) + sizeof(int) *
+ is->files[cat].alloc_entries_num, sizeof(int));
+ }
+ return block;
+}
+
+static void release_block (ISAMH is, int cat, int pos)
+{
+ char *abuf = is->files[cat].alloc_buf;
+ int block = is->files[cat].head.freelist;
+
+ (is->files[cat].no_released)++;
+
+ if (block && !is->files[cat].alloc_entries_num) /* must read block */
+ {
+ bf_read (is->files[cat].bf, block, 0, 0, abuf);
+ memcpy (&is->files[cat].alloc_entries_num, abuf,
+ sizeof(is->files[cat].alloc_entries_num));
+ assert (is->files[cat].alloc_entries_num > 0);
+ }
+ assert (is->files[cat].alloc_entries_num <= is->files[cat].alloc_entries_max);
+ if (is->files[cat].alloc_entries_num == is->files[cat].alloc_entries_max)
+ {
+ assert (block);
+ memcpy (abuf, &is->files[cat].alloc_entries_num, sizeof(int));
+ bf_write (is->files[cat].bf, block, 0, 0, abuf);
+ is->files[cat].alloc_entries_num = 0;
+ }
+ if (!is->files[cat].alloc_entries_num) /* make new buffer? */
+ {
+ memcpy (abuf + sizeof(int), &block, sizeof(int));
+ is->files[cat].head.freelist = pos;
+ is->files[cat].head_is_dirty = 1;
+ }
+ else
+ {
+ memcpy (abuf + sizeof(int) +
+ is->files[cat].alloc_entries_num*sizeof(int),
+ &pos, sizeof(int));
+ }
+ is->files[cat].alloc_entries_num++;
+}
+#else
+static void flush_block (ISAMH is, int cat)
+{
+ char *abuf = is->files[cat].alloc_buf;
+ xfree (abuf);
+}
+
+static int alloc_block (ISAMH is, int cat)
+{
+ int block;
+ char buf[sizeof(int)];
+
+ is->files[cat].head_is_dirty = 1;
+ (is->files[cat].no_allocated)++;
+ if ((block = is->files[cat].head.freelist))
+ {
+ bf_read (is->files[cat].bf, block, 0, sizeof(int), buf);
+ memcpy (&is->files[cat].head.freelist, buf, sizeof(int));
+ }
+ else
+ block = (is->files[cat].head.lastblock)++;
+ return block;
+}
+
+static void release_block (ISAMH is, int cat, int pos)
+{
+ char buf[sizeof(int)];
+
+ (is->files[cat].no_released)++;
+ is->files[cat].head_is_dirty = 1;
+ memcpy (buf, &is->files[cat].head.freelist, sizeof(int));
+ is->files[cat].head.freelist = pos;
+ bf_write (is->files[cat].bf, pos, 0, sizeof(int), buf);
+}
+#endif
+
+int isamh_alloc_block (ISAMH is, int cat)
+{
+ int block = 0;
+
+ if (is->files[cat].fc_list)
+ {
+ int j, nb;
+ for (j = 0; j < is->files[cat].fc_max; j++)
+ if ((nb = is->files[cat].fc_list[j]) && (!block || nb < block))
+ {
+ is->files[cat].fc_list[j] = 0;
+ block = nb;
+ break;
+ }
+ }
+ if (!block)
+ block = alloc_block (is, cat);
+ if (is->method->debug > 3)
+ logf (LOG_LOG, "isc: alloc_block in cat %d: %d", cat, block);
+ return block;
+}
+
+void isamh_release_block (ISAMH is, int cat, int pos)
+{
+ if (is->method->debug > 3)
+ logf (LOG_LOG, "isc: release_block in cat %d: %d", cat, pos);
+ if (is->files[cat].fc_list)
+ {
+ int j;
+ for (j = 0; j<is->files[cat].fc_max; j++)
+ if (!is->files[cat].fc_list[j])
+ {
+ is->files[cat].fc_list[j] = pos;
+ return;
+ }
+ }
+ release_block (is, cat, pos);
+}
+
+static void init_fc (ISAMH is, int cat)
+{
+ int j = 100;
+
+ is->files[cat].fc_max = j;
+ is->files[cat].fc_list = (int *)
+ xmalloc (sizeof(*is->files[0].fc_list) * j);
+ while (--j >= 0)
+ is->files[cat].fc_list[j] = 0;
+}
+
+static void release_fc (ISAMH is, int cat)
+{
+ int b, j = is->files[cat].fc_max;
+
+ while (--j >= 0)
+ if ((b = is->files[cat].fc_list[j]))
+ {
+ release_block (is, cat, b);
+ is->files[cat].fc_list[j] = 0;
+ }
+}
+
+void isamh_pp_close (ISAMH_PP pp)
+{
+ ISAMH is = pp->is;
+
+ (*is->method->code_stop)(ISAMH_DECODE, pp->decodeClientData);
+ xfree (pp->buf);
+ xfree (pp);
+}
+
+ISAMH_PP isamh_pp_open (ISAMH is, ISAMH_P ipos)
+{
+ ISAMH_PP pp = (ISAMH_PP) xmalloc (sizeof(*pp));
+ char *src;
+
+ pp->cat = isamh_type(ipos);
+ pp->pos = isamh_block(ipos);
+
+ src = pp->buf = (char *) xmalloc (is->method->filecat[pp->cat].bsize);
+
+ pp->next = 0;
+ pp->size = 0;
+ pp->offset = 0;
+ pp->is = is;
+ pp->decodeClientData = (*is->method->code_start)(ISAMH_DECODE);
+ pp->deleteFlag = 0;
+ pp->numKeys = 0;
+
+ if (pp->pos)
+ {
+ src = pp->buf;
+ isamh_read_block (is, pp->cat, pp->pos, src);
+ memcpy (&pp->next, src, sizeof(pp->next));
+ src += sizeof(pp->next);
+ memcpy (&pp->size, src, sizeof(pp->size));
+ src += sizeof(pp->size);
+ memcpy (&pp->numKeys, src, sizeof(pp->numKeys));
+ src += sizeof(pp->numKeys);
+ assert (pp->next != pp->pos);
+ pp->offset = src - pp->buf;
+ assert (pp->offset == ISAMH_BLOCK_OFFSET_1);
+ if (is->method->debug > 2)
+ logf (LOG_LOG, "isc: read_block size=%d %d %d next=%d",
+ pp->size, pp->cat, pp->pos, pp->next);
+ }
+ return pp;
+}
+
+/* returns non-zero if item could be read; 0 otherwise */
+int isamh_pp_read (ISAMH_PP pp, void *buf)
+{
+ return isamh_read_item (pp, (char **) &buf);
+}
+
+/* read one item from file - decode and store it in *dst.
+ Returns
+ 0 if end-of-file
+ 1 if item could be read ok and NO boundary
+ 2 if item could be read ok and boundary */
+int isamh_read_item (ISAMH_PP pp, char **dst)
+{
+ ISAMH is = pp->is;
+ char *src = pp->buf + pp->offset;
+
+ if (pp->offset >= pp->size)
+ {
+ if (!pp->next)
+ {
+ pp->pos = 0;
+ return 0; /* end of file */
+ }
+ if (pp->next > pp->pos)
+ {
+ if (pp->next == pp->pos + 1)
+ is->files[pp->cat].no_next++;
+ else
+ {
+ is->files[pp->cat].no_forward++;
+ is->files[pp->cat].sum_forward += pp->next - pp->pos;
+ }
+ }
+ else
+ {
+ if (pp->next + 1 == pp->pos)
+ is->files[pp->cat].no_prev++;
+ else
+ {
+ is->files[pp->cat].no_backward++;
+ is->files[pp->cat].sum_backward += pp->pos - pp->next;
+ }
+ }
+ /* out new block position */
+ pp->pos = pp->next;
+ src = pp->buf;
+ /* read block and save 'next' and 'size' entry */
+ isamh_read_block (is, pp->cat, pp->pos, src);
+ memcpy (&pp->next, src, sizeof(pp->next));
+ src += sizeof(pp->next);
+ memcpy (&pp->size, src, sizeof(pp->size));
+ src += sizeof(pp->size);
+ /* assume block is non-empty */
+ assert (src - pp->buf == ISAMH_BLOCK_OFFSET_N);
+ assert (pp->next != pp->pos);
+ if (pp->deleteFlag)
+ isamh_release_block (is, pp->cat, pp->pos);
+ (*is->method->code_item)(ISAMH_DECODE, pp->decodeClientData, dst, &src);
+ pp->offset = src - pp->buf;
+ if (is->method->debug > 2)
+ logf (LOG_LOG, "isc: read_block size=%d %d %d next=%d",
+ pp->size, pp->cat, pp->pos, pp->next);
+ return 2;
+ }
+ (*is->method->code_item)(ISAMH_DECODE, pp->decodeClientData, dst, &src);
+ pp->offset = src - pp->buf;
+ return 1;
+}
+
+int isamh_pp_num (ISAMH_PP pp)
+{
+ return pp->numKeys;
+}
+
+/*
+ * $Log: isamh.c,v $
+ * Revision 1.1 1999-06-30 15:04:54 heikki
+ * Copied from isamc.c, slowly starting to simplify...
+ *
+ */
\ No newline at end of file
projects / idzebra-moved-to-github.git / commitdiff